http://elecraft.85.s1.nabble.com/K3-Filter-Ring-with-Noise-tp3410069p3411102.html
You did a wonderful job explaining exactly what I've noticed. To me, it
characters. This only happens when signals are weak and the band is noisy. I
virtually no roofing filter (15kHz). The same noise has no effect on it. I
bandpass, like 6kHz away, and pumps the hardware AGC violently. Then it's
avail. I don't consider this "ringing" since that's not what I'm hearing.
> I've had my K3, which I assembled, about a month, outfitted with 13kHz,
> 6kHz,
> 2.8kHz, and 400Hz filters. Thus far I've been exceptionally pleased with
> all
> aspects of the rig. I've read with interest the audio discussions of this
> group. There is one area in which I'm not totally satisfied, but this may
> be
> due, partially, with my expectations of the rig.
>
> When using CW on noisy bands, meaning the sort of atmospheric noise we
> often
> are having now (NOT static crashes from storms), there appears to be an
> audio
> product as the bandwidth is narrowed which is annoying to my ears, which
> occurs both in speakers and phones. This is basically like a ringing of
> the
> filters and especially evident as the passband is narrowed to 50-150Hz.
> This
> phenomenon is not a problem in quiet conditions nor if the station is
> especially strong, but can overpower a very weak station. (I'm using a
> pitch
> of 600Hz for CW.)
>
> (I've tried eliminating the 400Hz filter to make certain there isn't a
> problem there, and all is well with that filter, apparently.)
>
> I've been reducing RF gain and sometimes widening the passband to help
> aleviate the problem, as well as using the NR. I've also modified the RX
> equalizer from flat to settings of: #1=0, #2=3, #3=3, #4=-1, #5=-4, #6=-5,
> #7=-8, #8=-10. Admittedly, part of these settings accomodate SSB to give,
> what I hear, as a very pleasant sound for that mode. The primary ranges of
> this noise are affected mostly by filters #4 and #5.
>
> If the RX equalizer settings remain flat, hence 0, the sound is even more
> annoying. But remember this is really only in noisy conditions, so my
> hypothesis is that the chaotic sounds in the noise are mixing to produce
> what sounds like a ringing of the filters. (So not necessarily the filters
> actually ringing, as we think of it.) But this makes working very weak
> signals very difficult without widening the passband quite a bit.
>
> So, guess I would like to hear comments regarding this, as well as
> settings
> and techniques people use to combat this phenomenon.
>
> 73 ...Edwin, KD5ZLB
> ____________________________________________________________
> "Once you have flown, you will walk the earth with your eyes
> turned skyward, for there you have been, there you long to
> return."-da Vinci
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